Provide a flag to receive input from stdin

[vmalloc]

Relating to #38, this would make it even easier to use with M-| in emacs.

Many tools do this by accepting the special file name - as meaning stdin. This can also imply -d

[timothycrosley]

Hi vmalloc,

isort should already support this, example:

cat settings.py | isort -

will take results from settings.py sort it's imports then print to standard output. If you are encountering a problem with this please let me know and I will reopen.

Thanks!

Timothy

[vmalloc]

Oops - sorry. Indeed this already works. Thanks!